As for my side, I've never made it because I have only one solo clone box and to make one I need/create a motherboard without any parts on it to find out the real print tracks. I any case, as for the analog audio part you may have to deal with the U602, but as for the hdmi digital audio it may comes directly from the cpu. I can not say if the U602 could disable all audio outputs when it has some issues. To me it seems more logic that, when the audio fail on hdmi/scart/aud out and s/pidif, and it's not related to a wrong setting or software, then, it may be caused due the cpu. When the audio-hdmi works, but all other failed, then it could be the U602, but still, nothing is for sure, other motherboard issues may also cause it.